Alternative Name
Myeloid Differentiation Primary Response 88
Methodology
Molecular
Test Description

Bi-directional sequencing of exon 5 of the MYD88 gene which includes detection of the common L265P mutation. Testing is approved for specimens from the state of New York.

Clinical Significance

MYD88 mutation is the most common genetic abnormality in the activated B-cell-like (ABC) subtype of diffuse large B-cell lymphoma (DLBCL), detected in 40% of cases. Mutations are rare in the germinal center B-cell-like (GCB) subtype, so mutation analysis can be useful to differentiate between the ABC and GCB subtypes. The L265P mutation is present in >90% of Waldenstrom's macroglobulinemia (WM) and has been associated with increased risk of progression to WM in IgM MGUS patients. MYD88 is also implicated in susceptibility to BTK inhibitors in the treatment of B-cell neoplasms. Testing is available separately or in combination with three other contributory genes in the BTK Inhibitor Primary Susceptibility Panel.

Specimen Requirements
  • Peripheral blood: 5 mL in EDTA tube.
  • Bone marrow: 2 mL in EDTA tube.
  • FFPE tissue: Paraffin block is preferred. Alternatively, send 1 H&E slide plus 5-10 unstained slides cut at 5 or more microns. Please use positively-charged slides and 10% NBF fixative. Do not use zinc fixatives.
  • Fresh tissue: 0.5 - 1 cm3 in RPMI
Storage and Transportation

Use cold pack for transport, making sure cold pack is not in direct contact with specimen.

CPT Code(s)*
81305 (effective July 2019) | Prior CPT Code was 81479 (before July 2019)
Turnaround Time

7 days

Level of Service
Global

*The CPT codes provided with our test descriptions are based on AMA guidelines and are for informational purposes only. Correct CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed.